不完全變化動詞(英語:defective verb)是指變位不完全的動詞,也就是說在一個有變位的語言中,這一類動詞與普通的動詞相比,較少隨人稱、數、性、時態等進行詞形變化,甚至完全不進行變化。

英語

英語中典型的不完全變化動詞有助動詞情態動詞。例如can/couldmay/mightshall/shouldmustought towill/would等。

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